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CMMG Receiver Extension Nut
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

CMMG

Receiver Extension Nut

$8.95
Available California compliant

CMMG Receiver Extension Nut, Castle Nut for Buffer Tube, Fits AR-15, Matte Finish, Black 55CA9CB

Key Details
Brand CMMG
Manufacturer Part Number 55CA9CB
UPC 815835017426
SKU CMMG55CA9CB
Current Stock 658 available
Quantity Updated Apr 10, 2026 11:10 PM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

Since 2002 CMMG has been the leading manufacturer of AR-15 rifles, AR-10 rifles, and trailblazing AR technologies. CMMG offers premium AR-15 and AR-10 rifles, parts, and accessories.

Features
  • Castle Nut for Buffer Tubes
  • Fits AR-15
  • Matte black finish
Specifications
UPC: 815835017426
Manufacturer: CMMG
Manufacturer Part #: 55CA9CB
Model: Receiver Extension Nut
Finish: Matte
Type: Part